Bug#942669: ldb doesn't build for all supported python versions

[Matthias Klose]

Package: src:ldb
Version: 2:2.0.7-3
Severity: important
Tags: sid bullseye
ldb doesn't build for all supported python versions, while b-d on 
python3-all-dev.  Either drop that b-d, or build the extension for all supported 
python versions.